Hi, I played the game for a while and I have been wondering what some stuff for, I tried to search it by my own but I couldnt found anything. Go to the Shop, then go to exchange materials, then to materials, I know what the Gem Idea Regalia is for but I dont know about the Idea Cores, for example: Prision of fire, Idea Core, Prision of ice, Idea Core, I have like 20 of those but what are they for?